[time-nuts] GPS Modules Indoors
Hal Murray
hmurray at megapathdsl.net
Tue Nov 20 17:56:44 UTC 2012
celephicus at gmail.com said:
> I know that the accuracy of GPS degrades indoors. However, suppose that I
> just want to turn a GPS module on, acquire the current time accurate to a
> second, and then turn it off. I can get a good deal on the U-Blox LEA-5H
> modules (same as used on Arduino shields I think), which have a high
> sensitivity, and I can use an active antenna if needed.
You haven't defined "indoors". I think you will have to try it in your
location(s).
It won't work deep inside a machine room. We tried it once in a typical
two-story silicon valley office building. It didn't work there. We also
tried it in the 5th floor of a modern office building with a great view. It
didn't work, probably because of some anti-heat coating on the windows.
Inside my single floor house, they work most of the time.
albertson.chris at gmail.com said:
> I don't think GPS is ever so in accurate as to have a 1 second error. If it
> has a solution at all it is going to be at least within a millisecond.
I've seen occasional way-off "solutions" from GPS modules. I don't have
examples handy but I wouldn't depend on a single/quick answer in any critical
application.
--
These are my opinions. I hate spam.
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